Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: java.lang.NullPointerException
        at net.sf.japi.swing.ReflectionAction.actionPerformed(ReflectionAction.java:166)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:302)
        at javax.swing.plaf.basic.BasicRootPaneUI$Actions.actionPerformed(BasicRootPaneUI.java:190)
        at javax.swing.plaf.basic.BasicComboBoxUI$Actions.actionPerformed(BasicComboBoxUI.java:1393)
        at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1571)
        at javax.swing.JComponent.processKeyBinding(JComponent.java:2730)
        at javax.swing.JComponent.processKeyBindings(JComponent.java:2776)
        at javax.swing.JComponent.processKeyEvent(JComponent.java:2693)
        at javax.swing.JComboBox.processKeyEvent(JComboBox.java:1354)
        at java.awt.Component.processEvent(Component.java:5265)
        at java.awt.Container.processEvent(Container.java:1966)
        at java.awt.Component.dispatchEventImpl(Component.java:3955)
        at java.awt.Container.dispatchEventImpl(Container.java:2024)
        at java.awt.Component.dispatchEvent(Component.java:3803)
        at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1810)
        at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:668)
        at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:916)
        at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:794)
        at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:632)
        at java.awt.Component.dispatchEventImpl(Component.java:3841)
        at java.awt.Container.dispatchEventImpl(Container.java:2024)
        at java.awt.Window.dispatchEventImpl(Window.java:1766)
        at java.awt.Component.dispatchEvent(Component.java:3803)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Caused by: java.lang.NullPointerException
        at java.text.MessageFormat.applyPattern(MessageFormat.java:414)
        at java.text.MessageFormat.<init>(MessageFormat.java:350)
        at java.text.MessageFormat.format(MessageFormat.java:803)
        at net.sf.japi.swing.ActionFactory.format(ActionFactory.java:969)
        at net.sf.japi.swing.ActionFactory.showMessageDialog(ActionFactory.java:917)
        at cfeditor.ReplaceDialog.replaceOk(ReplaceDialog.java:409)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at net.sf.japi.swing.ReflectionAction.actionPerformed(ReflectionAction.java:147)
        ... 32 more